Catalytic Flame Synthesis of Carbon Nanotubes

碳纳米管的催化火焰合成

• 批准号: 0522556
• 负责人: Stephen Tse
• 金额: --
• 依托单位: Rutgers University New Brunswick
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-09-01 至 2008-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0522556&HistoricalAwards=false
• 关键词: Catalytic; Flame; Synthesis; Carbon; Nanotubes

Public AbstractAward CTS-0522556PI: Stephen D. TseCatalytic Flame Synthesis of Carbon NanotubesCarbon nanotubes (CNTs) define a new class of engineering materials with remarkable physical and electromagnetic properties, with a myriad of potential applications, including high-strength polymers, copolymers, composites, ceramics, moldable forms, molecular electronics and nano-scale machines, superconductors, delivery systems of bio-molecules to cells, fuel storage and batteries, flat-panel displays, and computer memory devices. Although various techniques have been developed for the production of CNTs, including pulsed arc discharge, pulsed laser ablation, and thermal chemical-vapor deposition, they are not readily or economically scalable for large-scale applications. Combustion synthesis of materials has demonstrated a history of scalability and offers the potential for continuous, efficient, high-volume production, without the need for expensive starting materials. As such, the objective of the proposed research program is to increase fundamental understanding of the mechanisms of catalytic CNT formation and growth in electrically-assisted flames, and utilization of that understanding to define process conditions that enable high-rate and high-purity synthesis of CNTs with prescribed characteristics (e.g. single- or multi-walled, diameter, helicity). The experiments are conducted using strategic aerodynamic flow fields, i.e. flat-flame stagnation-point (premixed) and flat-flame counterflow (non-premixed), to characterize the effects of fuel composition, flame temperature, inert addition, hydrogen addition, oxygen concentration, strain rate, and other controllable process parameters on CNT properties. The influence of the nature as well as the content of the transition metal (Ni, Fe, and Co) in the substrates on the yield and the quality of the CNTs formed will be investigated, along with the influence of electric fields in controlling CNT purity, alignment, helicity, and growth rate. Advanced laser-based diagnostics including spontaneous Raman spectroscopy, laser-induced fluorescence, and tunable diode laser absorption spectroscopy are employed to determine the local gas-phase chemical species concentrations and temperatures at the specific regions of CNT formation. The CNT material properties are characterized using electron microscopy, atomic force microscopy, and surface Raman spectroscopy. The research and experimental facility are incorporated into the curriculum on nanomaterials science and engineering. The involvement of underrepresented minorities and women in engineering is increased by supporting undergraduate research as part of the Douglass Project for Rutgers Women in Math, Science, and Engineering. The training of students (at high school, undergraduate, and graduate level) for the high-technology workforce is promoted by partnering with industry, state, and Center for Nanomaterials Research.

公共文摘奖CTS-0522556 PI：Stephen D.碳纳米管（CNTs）定义了一类具有显著物理和电磁性能的新工程材料，具有无数潜在应用，包括高强度聚合物、共聚物、复合材料、陶瓷、可模制形式、分子电子学和纳米尺度机器、超导体、生物分子到细胞的输送系统、燃料存储和电池、平板显示器、和计算机存储设备。 尽管已经开发了用于生产CNT的各种技术，包括脉冲电弧放电、脉冲激光烧蚀和热化学气相沉积，但是它们对于大规模应用而言不容易或经济上可扩展。 材料的燃烧合成已经展示了可扩展性的历史，并提供了连续、高效、大批量生产的潜力，而不需要昂贵的起始材料。 因此，拟议的研究计划的目的是增加对电辅助火焰中催化CNT形成和生长机制的基本理解，并利用这种理解来定义工艺条件，使具有规定特性（例如单壁或多壁，直径，螺旋度）的CNT的高速率和高纯度合成成为可能。 实验进行使用战略的空气动力学流场，即平火焰停滞点（预混）和平火焰逆流（非预混），表征燃料成分，火焰温度，惰性添加，氢气添加，氧气浓度，应变速率和其他可控的工艺参数对CNT性能的影响。 将研究衬底中过渡金属（Ni、Fe和Co）的性质以及含量对所形成的CNT的产率和质量的影响，沿着电场在控制CNT纯度、取向、螺旋度和生长速率中的影响。 先进的基于激光的诊断，包括自发拉曼光谱，激光诱导荧光，和可调谐二极管激光吸收光谱，以确定在特定区域的CNT形成的局部气相化学物质的浓度和温度。 使用电子显微镜、原子力显微镜和表面拉曼光谱表征CNT材料性质。 研究和实验设施被纳入纳米材料科学与工程课程。 通过支持本科生研究，作为罗格斯大学数学，科学和工程女性道格拉斯项目的一部分，少数民族和妇女参与工程的人数有所增加。 通过与工业、国家和纳米材料研究中心合作，促进对学生（高中、本科和研究生）的高科技劳动力培训。